32 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. XL 



SUBGENUS OCHROTOMYS. 



Peromyscus nuttalli aureolus (Auo. AND BACH.). Southern Golden Mouse. 

 GENUS REITHRODONTOMYS. 



[Reithrodontomys dychei ALLEN. Dyche's Harvest Mouse.] 



GENUS ORYZOMYS. 

 Oryzomys palustris (HARLAN). Rice Field Mouse. 



SUBFAMILY NEOTOMIN.E. 



GENUS NEOTOMA. 

 SUBGENUS NEOTOMA. 

 Neotoma floridana illinoensis HOWELL. Illinois Wood Rat. 



SUBFAMILY MICROTIN/E. 



GENUS EVOTOMYS. 

 Evotomys gapperi (VIGORS). Red-backed Mouse or Vole. 



GENUS MICROTUS. 

 SUBGENUS MICROTUS. 

 Microtus pennsylvanicus (ORD). Meadow Mouse or Vole. 



SUBGENUS PEDOMYS. 



Microtus ochrogaster (WAGNER). Prairie Meadow Mouse or Vole. 

 [Microtus minor MERRIAM. Little Meadow Mouse or Vole.] 



SUBGENUS PITYMYS. 

 Microtus pinetorum scalopsoides (Aun. AND BACH.). Mole Mouse or Mole-like Vole. 



GENUS FIBER. 

 Fiber zibethicus (LiNN.). Muskrat. 



GENUS SYNAPTOMYS. 

 SUBGENUS SYNAPTOMYS. 



Synaptomys cooperi BAIRD. Cooper's Lemming Mouse.]* 

 Synaptomys cooperi gossii (MERRIAM). Goss's Lemming Mouse. 

 Synaptomys cooperi fatuus (BANGS). Bangs's Lemming Mouse. 



FAMILY GEOMYID.^. POCKET GOPHERS. 



GENUS GEOMYS. 

 Geomys bursarius (SHAW). Pocket Gopher. 



FAMILY ZAPODID/E. JUMPING MICE. 

 SUBFAMILY ZAPODIN^E. 



GENUS ZAPUS. 

 Zapus hudsonius (ZiMM.). Hudson Bay Jumping Mouse. 



GENUS NAP^EOZAPUS. 

 [Napceozapus insignis (MILLER). Woodland Jumping Mouse.] 



*I have seen no typical specimens of 5. cooperi from Illinois, but specimens from the east 

 central part of the state are intermediate between cooperi and gossii. 



